थर्मस फ्लास्क के आविष्कार� – McqOptions

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1.	थर्मस फ्लास्क के आविष्कारक है ?
A.	डिवार
B.	स्टीफन
C.	किरचॉफ
D.	न्यूटन
Answer» B. स्टीफन

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